Skin treatment apparatus



FIG. 1 is a perspective of a skin treatment apparatus, showing my new design from the front, top and right side;

FIG. 2 is a perspective view thereof, from the bottom, rear and left side;

FIG. 3 is a left side view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof. 

The ornamental design for a skin treatment apparatus, as shown and described. 